JPH10328993A - Shape of lens measuring device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To correctly measure the full periphery of a lens optical edge by comprising a control means which detects the difference in level, of a lens to be machined on the basis of the amount of change of a measurement data by a gauge head, and providing a control means to perform the contact control of the gauge head. SOLUTION: When a difference in level of the double focus lens is judged, the measurement is further advanced from a position of the difference in level, the measurement is temporarily stopped before the estimated difference in level at an opposite side, and a feeler 66 is once returned in an opened condition, between a starting point of the measurement and the first difference in level. From the position, an operation control circuit 100 rotates the lens shafts 16, 17 backward through a pulse motor 18. Whereby the measurement is performed from the higher difference in level to the lower one at the opposite side, and the measurement is continued till the position where the measurement is stopped first, or the position over the same. The thickness of the lens optical edge of the full periphery is measured on the basis of the both data.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lens shape measuring device for measuring the edge thickness of a spectacle lens framed in a spectacle frame.

[0002]

2. Description of the Related Art Conventionally, in an eyeglass lens edge thickness measuring apparatus, as shown in Japanese Patent Application Laid-Open No. Hei 7-314307, a feeler as a tracing stylus is formed by a rotatable member, and a lens frame or template of an eyeglass frame is formed. It is arranged on the processing locus on the front surface and the rear surface of the spectacle lens having a predetermined relationship with the target lens shape, and measures the edge thickness of the spectacle lens.

[0003] This is to prevent the refraction surface of the spectacle lens from being damaged by the frictional resistance from the front and rear surfaces of the spectacle lens, or the measuring element itself from being deformed or damaged.

In particular, when measuring the edge thickness of an eyeglass lens (EX lens) having a step at the boundary between the distance portion and the near portion due to a difference in the lens thickness between the distance portion and the near portion, the tracing stylus is simply moved forward and backward. This is to solve the problem that the measuring element is caught on the step only by contacting with the refracting surface of the above, and the edge thickness cannot be measured accurately.

[0005]

However, in the conventional edge thickness measuring apparatus, particularly in the case of the EX lens, when the lens thickness between the distance portion and the near portion has a remarkable step, the portion where the lens thickness is thin is small. When the spectacle lens is rotated from a thick portion to a thick portion, a tracing stylus formed simply of a rotatable member cannot overcome the step, and may still be caught.

In the conventional edge thickness measuring device, the E
Since it is not possible to determine how much the X lens has a step, there is a possibility that the entire circumference of the edge of the spectacle lens cannot be accurately measured.

As a result, it has not been possible to realize a frame fit of a spectacle lens with a good fit to the spectacle frame, and it has not been possible to form good-looking spectacles according to the taste of each spectacle wearer.

Therefore, in the present invention, in order to solve the above problem, it is determined whether or not the amount of change in the measurement data by the tracing stylus is larger than a predetermined value, thereby determining how much the step of the spectacle lens has. If the level difference is significant, the entire circumference of the lens edge can be accurately measured by controlling the rotation direction of the spectacle lens and the contact position of the tracing stylus with the spectacle lens. An object of the present invention is to provide a lens shape measuring device capable of realizing a frame fit of a spectacle lens with a good fit.

[0009]

According to the present invention, in order to achieve this object, a lens rotating shaft for rotatably supporting a lens to be processed is disposed in contact with a processing locus on a front surface and / or a rear surface of the lens to be processed. And a control means for determining whether or not the amount of change in the measurement data by the tracing stylus is greater than a predetermined value and performing contact control of the tracing stylus.

[0010]

Embodiments of the present invention will be described below with reference to the drawings.

[First Embodiment] <Grinding part> In FIG. 13, reference numeral 1 denotes a housing-like body of a ball mill, 2 denotes an inclined surface provided on the upper front side of the main body 1, and 3 denotes a right side of the inclined surface 2. The liquid crystal display unit 4 provided on the half is a keyboard unit provided on the lower right side of the inclined surface 2.

In addition, concave portions 1a and 1b are provided at the center and near the left side of the main body 1, and a grindstone 5 rotatably held by the main body 1 is provided in the concave portion 1a.
The grindstone 5 includes a rough grindstone 6 and a V-groove grindstone 7, and is rotatably driven by the motor 8 shown in FIG.

In the main body 1, a support base 9 for supporting the carriage shown in FIG. 5 is fixed. The support 9 is provided with left and right legs 9a and 9b, and the legs 9b are biased toward the legs 9b.
a, 9b, intermediate legs 9c, legs 9a to 9c
And a mounting plate 9d connecting the upper ends of the mounting plates 9d.

Further, brackets 10 and 11 for mounting the shaft are provided on both sides of the mounting plate 9d. The brackets 10 and 11 have a supporting shaft (a swinging shaft, that is, a turning shaft).
Bearings B fitted to both left and right ends of the support shaft 12 are held, and a cylindrical shaft (swinging cylindrical shaft) 13 is fitted to the outer periphery of the support shaft 12 so as to be movable in the axial direction. This support shaft 12,
The cylindrical shaft 13 and the like are covered with a cover 14 shown in FIG.

In the cover 14, a carriage 15 is provided, and a cover plate-shaped swing arm 300 and a processing pressure adjusting device 310 attached to the swing arm 300 are provided.

In FIG. 2, a hollow water receiving container A is mounted in the main body 1. The water receiving container A includes a lower water receiving cover (a water receiving container main body that is a water receiving cover) 401 opening upward and a water receiving cover 40.
1 has a water receiving upper cover 402 for closing the upper open end. Then, a processing chamber BA is formed in the water receiving container A, and the above-described grindstone 5 and the carriage 1 are provided in the processing chamber BA.
5 are provided.

In addition, the carriage 15 can be swung up and down in the processing chamber BA.
The swing arm 300 and the like are arranged outside the water receiving cover 401. In addition, as shown in FIG. 13, the water receiving upper cover 402 has an opening C for taking in and out the lens L to be processed, and a lens access window (open / close window).
The opening C is opened and closed by a window cover (not shown). Thereby, the lens L to be processed can be put in and out of the processing chamber.

As shown in FIG. 4, waterproof bellows 403, 403 are attached between the carriage 15 and the side walls 401a, 401b of the water receiving cover 401.

<Carriage> The carriage 15 has a carriage body 15a, mutually parallel arms 15b and 15c integrally provided forward on both sides of the carriage body 15a, and a center of the rear edge of the carriage body 15a. Has a projection 15d protruding rearward. The above-described cylindrical shaft 13 penetrates the protrusion 15d right and left, and is fixed to the protrusion 15d. Thus, the front end of the carriage 15 can be turned up and down around the support shaft 12.

A lens rotating shaft 16 is rotatably held on the arm 15b of the carriage 15, and the carriage 1
A lens rotating shaft 17 disposed coaxially with the lens rotating shaft 16 is rotatably held on the arm 15c of the fifth arm 15c so as to be able to advance and retreat with respect to the lens rotating shaft 16. The lens L to be processed is sandwiched between the opposed ends (between the one ends) of the lenses 17.

The lens rotating shafts 16 and 17 are rotatably driven by a shaft rotation driving device (shaft rotation driving means). This shaft rotation driving device has a pulse motor 18 fixed in the carriage main body 15a, and a power transmission mechanism (power transmission means) 19 for transmitting rotation of the pulse motor 18 to the lens rotation shafts 16 and 17.

As shown in FIG. 1, the power transmission mechanism 19 includes timing pulleys 20 and 20 mounted on lens rotation shafts 16 and 17, respectively, and a carriage body 15a.
A rotating shaft 21 rotatably held by the motor, and timing pulleys 22 fixed to both ends of the rotating shaft 21, respectively.
, A timing belt 23 stretched over timing pulleys 20 and 22, and a gear 24 fixed to the rotating shaft 21.
And a pinion 25 for output of the pulse motor 18 and the like.

As shown in FIGS. 5 and 7, the upper end of the support arm 26 is held on the support shaft 12 so as to be movable left and right (not shown in FIGS. 1 and 6). Moreover, the support shaft 12 is connected so as to be integrally movable with the cylindrical shaft 13 in the axial direction. Incidentally, both ends of a guide shaft 26a parallel to the support shaft 12 are fixed to the legs 9b and 9c as shown in FIG. The guide shaft 26a penetrates the lower end of the support arm 26, and guides the support arm 26 to be movable left and right.

<Carriage Lateral Moving Means> As shown in FIG.
And can be driven to move left and right.

As shown in FIG. 5, the carriage lateral moving means 29 includes a mounting plate 3 fixed to the leg 9c and the mounting plate 9d.
0a, a stepping motor 31 fixed to the front surface of the mounting plate 30a, and a mounting plate 30a of the stepping motor 31.
, A pulley 32 fixed to an output shaft 31a protruding to the rear side, a pulley 32a rotatably mounted on the rear surface of the leg 9b, and a support arm wound around the pulleys 32, 32a and having both ends. 26 has a wire 33 fixed to it.

<Swing Arm 300> The swing arm 300 is formed of a plate as described above. At both ends of the swing arm 300 in the left-right direction (Z direction), as shown in FIGS. 1 and 6A, protrusions 301 and 302 projecting forward are provided. This protrusion 3
01, 302 are provided with semicircular holding portions 301a, 3
The holding portions 301a and 302a are fitted to both ends of the cylindrical shaft 13. In addition, this holding part 30
Reference numerals 1a and 302a are fixed to the cylindrical shaft 13 by fixing means such as a screw or an adhesive (not shown).

<Working Pressure Adjusting Means 310> As shown in FIG. 6B, the working pressure adjusting means 310 has a mounting frame 311 serving as a mounting base. The mounting frame 311 includes a base plate 312 disposed on the lower surface of one side of the swing arm 300 in parallel with the swing arm 300, and a side plate extending in the front-rear direction (X direction) and fixed to the right side of the base plate 312. 313, a front side plate 314 fixed to the front edge of the base plate 312 and the side plate 313, and a rear side plate 315 fixed to the rear edge of the base plate 312 and the side plate 313. The mounting frame 311 is fixed to the lower surface of the swing arm 300 via a bracket, a screw, or the like (not shown).

The processing pressure adjusting means 310 includes a cubic weight 316 disposed above the base plate 312, a guide shaft 317 extending through the weight 316 in the front-rear direction (X direction), It has a feed screw 318 that is screwed to a female screw (not shown) extending in the front-rear direction provided on the weight 316 and penetrates the weight 316. Both ends of the guide shaft 317 are fixed to the side plates 314 and 315, and the feed screw 318 is rotatably held at both ends by the side plates 314 and 315. Note that the guide shaft 317 and the feed screw 318 are provided in parallel.

Further, the processing pressure adjusting means 310 includes a bracket 319 fixed on the base plate 312, a pulse motor 320 fixed to the bracket 319 and having an output shaft 320a directed in the front-rear direction, and an output of the pulse motor 320. It has a timing gear 321 fixed to the shaft 320a, a timing gear 322 fixed to a portion near the rear end of the feed screw 317, and a timing belt 323 wound around the timing gears 321 and 322. Thereby, the rotation of the pulse motor 320 is controlled by the timing gear 32.
1, 322 and the timing belt 323 to the feed screw 317.

When the pulse motor 320 is rotated forward, the feed screw 318 is rotated forward to move the weight 316 in the forward direction. On the other hand, when the pulse motor 37 is rotated in the reverse direction, the feed screw 318 is rotated in the reverse direction. Let me be the weight 3
16 can be moved rearward.

<Carriage Elevating Means> Also, the carriage elevating means 3 is provided on the rear edge of the swing arm 300 described above.
6 are provided. The carriage lifting / lowering means 36
A pulse motor 37 disposed vertically above the swing arm 300 and held in the main body 1 via a bracket (not shown), and coaxially and integrally with an output shaft 37a of the pulse motor 37. A female screw 38 provided, a female screw cylinder 39 screwed to the female screw 38 so as to be vertically movable, and a spherical pressing member 40 integrally provided at the lower end of the female screw cylinder 39
Having. The female screw cylinder 39 is held in the main body 1 via a bracket (not shown) so as to be non-rotatable around the axis and to be vertically movable.
Abut on the upper surface of the

<Eye Shape Measurement Unit (Eye Shape Measurement Means)> The eye shape measurement unit 46 includes a pulse motor 47, a rotating arm 48 attached to an output shaft 47 a of the pulse motor 47, and a rotating arm 48. Rail 49 held in
A filler support 50 movable in the longitudinal direction along the rail 49, a filler 51 (contact) mounted on the filler support 50, an encoder 52 for detecting an amount of movement of the filler support 51, It has a spring 53 for urging the support 51 in one direction.

It is to be noted that the lens shape measuring section 46 may be formed integrally with the lens processing device, or may be formed separately from the lens processing device and electrically connected to each other. The lens frame shape data measured by the lens frame shape measuring device may be temporarily input to a floppy disk or an IC card, and the lens processing device may be provided with a reading device for reading data from these storage media,
The configuration may be such that the eyeglass frame maker can input lens frame shape data to the lens processing apparatus online.

<Edge thickness measuring means 60> The edge thickness measuring means 60 shown in FIGS.
However, in order to reduce the size of the carriage 15, a waterproof cover for covering the upper portion of the carriage 15 as shown in FIGS. 2, 3, and 8A to 8C is actually used. Cover 40
2 attached to the upper part. In this case, the edge thickness measuring means 60 is disposed so as to be inclined from the swing arm 300 side to the front side, corresponding to the lens L to be processed held by the lens rotation shafts 16 and 17 in FIG. Is done.

Further, the feeler 66 of the edge thickness measuring means 60 can be moved into and out of the processing chamber BA through the opening 402a provided in the waterproof upper cover 402. However, during the grinding of the lens L to be processed by the grindstone 5, When the grinding fluid is supplied from a grinding fluid supply nozzle (not shown) to the grinding unit, the grinding fluid (grinding water) scattered from the lens to be processed or the grinding unit is prevented from permeating into the edge thickness measuring means 60 through the opening 402a. The opening / closing device 80 of the edge thickness measuring device shown in FIG. 8A is mounted between the processing chamber and the edge thickness measuring means 60, that is, on the waterproof upper cover 402 at the position of the opening 402a as follows. I have.

That is, the opening 402a is closed by the mounting plate 501 mounted on the upper waterproof cover 402 with the screw B1. The mounting plate 501 has a recess 501a protruding toward the processing chamber BA, and an opening 501c is formed in the bottom (bottom wall) 501b of the recess 501a. Also,
The mounting plate 50 along the concave portion 501a is provided in the concave portion 501a.
2 is fixed with a screw B2.

Further, the opening / closing device 80 for the edge thickness measuring device is
A bearing (a bearing projection) 83 provided on one side of an upper open end of the concave portion 502a and protruding from the mounting plate 502;
It has a bearing (bearing projection) 83 'that is fixed to the mounting plate 501 with a screw 83a at the other side of the upper open end of the upper opening 2a, and a rotating body D having a lower half disposed in the recess 502a. The rotating body D includes a cylindrical body 81 and end wall members 81b, 81b disposed in both ends of the cylindrical body (cylindrical window member) 81, and a cylindrical body 81 spaced apart in the circumferential direction. It has the screws S1 and S2 to be fixed to 81b. In FIG. 8A, 502b is the bottom (bottom wall) of the mounting plate 502, and 502c is the bottom 502b.
It is an opening provided in.

Then, the shaft portion 8 of the end wall members 81b, 81b
1c and 81c are rotatably held by bearings 83 and 83 '. Further, a pair of window openings 81d, 81d extending in the longitudinal direction are formed in the cylindrical body 81 at intervals of 180 ° in the circumferential direction. The feeler 66 (219 and 220 in FIG. 16 to be described later) can enter and exit through the window openings 81d and 81d.

The holding plate 86 disposed along the periphery of the opening 502a is fixed to the mounting plate 501 with screws 86a.
The packing 85 located above the holding plate 86 is aligned with the opening 501c of the mounting plate 501 so that the bottom 5 of the mounting plate 501
01b. Reference numeral 86a denotes an opening of the holding plate 80. When sealing the opening 501c, the packing 8 is used.
5 is located around the opening 81d and is in elastic contact with the cylindrical body 81. In the drawing, the packing 85 has the cylindrical body 81 with the opening 8.
The gasket 85 is located around 1d and elastically contacts the cylindrical body 81. The packing 85 may be formed to be substantially equal to or slightly larger than the opening 81d of the cylindrical body 81.

A gear 88 fixed to one shaft portion 81c of the cylindrical body 81 is meshed with a gear 87 fixed to an output shaft of a drive motor 82, and the rotation is controlled by the drive motor 82. The drive motor 82 is fixed to the waterproof upper cover 402 via a bracket BT. Microswitches 89 and 90 are attached to the bracket Bt.

When the edge thickness measurement mode is selected, FIG.
The cylinder 81 is rotated by the motor 82 of FIG. 8A via the gears 86 and 87 so that the state shown in FIG. This rotation position is in the cylinder 81 as shown in FIG.
For example, the micro switches 89 and 90 are used for positioning by using the heads sa and sb of the screws S1 and S2.

The lens edge thickness measuring device 60 has a bracket 61 formed in a U-shape as shown in FIG. 7 and mounted on the carriage 15 and a bracket 61 which can move forward and backward with respect to the left side of the rough grind 5. A filler shaft 62 (measurement arm) held by 61, a rack 63 provided on the filler shaft 62, a pulse motor 64 fixed to the bracket 61, and an output shaft 64 a of the pulse motor 64 fixed to the rack 63 Meshed pinion 65 and filler shaft 6
A disc-shaped filler 66 integrally provided at one end of
There is a microswitch 67 fixed on the carriage 15 at the other end of the filler shaft 62.

The microswitch 67 is provided with a filler 6
When the lens 6 is retracted to a position outside the lens L to be processed, the other end of the filler shaft 62 is pressed and turned on.

<Electric part> Operation control circuit 100 of electric part D
(Control means) The motor 8, the stepping motor 31, the pulse motors 18, 37, 47, and 6 of the above-mentioned grinding section.
4 and the like, a drive controller 101 for driving and controlling the like, a frame data memory 102, an FPD / PD input device 103 for inputting a frame PD value FPD and a wearer interpupillary distance value PD, and a spectacle frame being a cell frame. A frame material input device 104 for inputting a message, a correction value memory 105 storing a correction value C predetermined according to the material of the frame, and processing data for processing the lens L
A processing data memory 106 for storing (Pi, Θi) is connected.

The FPD / PD input device 103 may be a manual input device such as a ten-key input device, an online input from an optometric device, or a reading device from optometric data storage means such as a floppy disk or an IC card. May be.

Further, the drive controller 101 is operated by the arithmetic and control unit 100 to generate a drive pulse from the pulse generator 106, and the pulse motor 47
Is operated, the rotary arm 48 is rotated. As a result, the feeler 51 is moved to the eyeglass frame F (eyeglass frame).
Is moved along the inner circumference of the lens frame RF or LF.

At this time, the moving amount of the feeler 51 described above is detected by the encoder 52 and is defined as the moving radius length fρi by the electrical component D
The same pulse as that supplied to the pulse motor 47 from the pulse generator 106 is input to the frame data memory 102 as the rotation angle of the rotary arm 48, that is, the radial angle fθi, and the frame (or template) ) Is stored as the radial data (fρi, fθi).

The operation of the lens processing apparatus having the above configuration will be described below.

(1) Eyeglass Shape Measurement First, the eyeglass shape measuring unit 46 is operated to obtain the shape shown in FIGS.
The shape of the eye frame such as the right eye lens frame RF or the mold plate of the eyeglass frame F as shown in FIG. 2 is measured, and the radial data (fρi, fθi) of the eyeglasses such as the lens frame (or the mold plate) are measured. (Where i =
1, 2, 3,... N) are obtained and stored in the frame data memory 102.

When the spectacle frame F is a cell frame, the processor inputs the fact to the arithmetic and control circuit 100 using the frame material input device 104.

The processor inputs the frame PD value FPD and the wearer's interpupillary distance value PD to the arithmetic and control circuit 100 through the FPD / PD input device 106. The arithmetic and control circuit 100 calculates the optical center of the right eye lens by the deformation of the spectacle frame after the lens framing from the input frame PD value FPD, the interpupillary distance value PD and the correction value C stored in the correction value memory 105. The correction inset amount IN 'in consideration of the OLR shift is obtained as IN' = {(FPD-PD) / 2} -C / 2 (1), and the lens frame stored in the frame data memory 102 is obtained. For each sampling point Qi of the lens frame (or template) radial data (fρi, fθi) having the origin at the geometric center of RF, the radial data is converted into xy coordinates. And calculate the x-coordinate value by the correction inset amount IN ′ in the x-axis direction.
(Horizontal direction) and process data based on the new origin
(Pi, Θi) (where i = 1, 2, 3, ……… N) And this is stored in the processing data memory 102.

Here, the correction value C is 0.3 to 0.5 mm when the spectacle frame F is made of a general material such as acetate, acrylic, nylon or propionate, and 0.8 when the spectacle frame F is made of a material rich in thermoplastic such as epoxy resin. ~ 1.0mm is selected. In order to correspond to a plurality of types of cell frames in this way, a plurality of input keys are provided in the frame material input device 107, and a plurality of correction values C are stored in the correction value memory 105 corresponding to each frame material input. It is good.

(2) Measurement of lens edge thickness Wi Next, the edge thickness Wi of the lens L to be processed is calculated based on the processing data (Pi, Θi) corresponding to the radial data (fρi, fθi) obtained in (1). Ask.

W In other words, when the keyboard unit 4 is operated to set the edge thickness measurement mode, the arithmetic and control unit 100 controls the driving of the pulse motor 18 via the drive controller 101, and the rotation of the pulse motor 18 is transmitted to the power transmission mechanism. 19
Are transmitted to the lens shafts 16 and 17 via the first processing data (P1, P1) among the processing data (Pi, P1) of the lens L to be processed.
1) is moved to the contact position of the feeler 66.

Before moving the feeler 66 to the joint position of the lens L to be processed, the window of the cylindrical body 81 of the opening and closing device 80 for the edge thickness measuring device between the edge thickness measuring means 60 and the processing chamber should be closed. When the thickness measurement mode is set, open it.

When the edge thickness measurement mode is selected, the cylinder 81 is rotated via the gears 88 and 87 by the motor 82 shown in FIG. 8A, and as shown in FIG. ). This rotation position is as shown in FIG.
For example, by using the positioning using the heads sa and sb of the screw S1 (S2), the microswitch 88,
Control is performed at 89.

After the state as shown in FIG. 8C is reached, the feeler 66 or 219 and 220 is put into the processing chamber, and the lens L to be processed is measured.

When processing is performed, grinding water or grinding debris may adhere to the cylinder 81. As described above, when the grinding water or grinding debris adheres to the opening / closing windows of the feeler 66 or 219 and 220, the conventional method of opening and closing a flat plate-like material solidifies between the fixed base 402 and the opening and closing. Anything that cannot be done or that adheres when opening and closing may enter the feeler measuring unit, causing a failure.

In the case of FIG. 8A, the cylinder is rotated at the time of opening and closing, and the outer periphery is brought into contact with a packing 85 at that time.
5, so that it does not enter the feeler measuring section. Further, the packing 85 also plays a role of waterproofing between the cylindrical body 81 and the processing chamber BA.

Further, as compared with a conventional plate-shaped member which is opened and closed, only a cylindrical member needs to be rotated, so that the mechanism is simple and a compact structure can be realized.

Further, the keyboard unit 4 is operated, and the stepping motor 31 is operated by the arithmetic and control unit 100.
The carriage 15 is moved to the left in FIG. At this time, the movement amount of the carriage 15 is input to the arithmetic control circuit 100.

After that, the drive controller 101 is operated by the arithmetic and control circuit 100 and the pulse motor 64 is operated.
Is driven to move the filler shaft 62 onto the grindstone 5 via the pinion 65 and the rack 63, and the feeler 66 of the filler shaft 62 is moved to the side of the lens L to be processed.

At this time, when the feeler shaft 62 moves away from the micro switch 67 with the movement of the feeler shaft 62 and the micro switch 67 is turned off, this OFF signal is input to the arithmetic control circuit 100, and the arithmetic control circuit 100 The movement amount of the feeler shaft 62 from the start of the OFF is detected from the number of drive pulses to the pulse motor 64. Moreover, the feeler 66 stores the processing data (Pi, Θ) of the lens L to be processed.
It is moved to the portion corresponding to the position of the initial machining data (P1, # 1) in i).

In this state, when the power supply to the stepping motor 31 is stopped and the stepping motor 31 is freely rotated, the carriage 15 and the support arm 26 are urged to move rightward in FIG. 16,1
The refracting surface on the right side of the lens L to be processed held between the seven abuts against the feeler 66. At this time, the contact position is the position of the initial processing data (P1, # 1) of the lens L to be processed.

Then, the arithmetic and control circuit 100 controls the driving of the pulse motors 18 and 64 from the initial contact position of the feeler 66 to determine the contact position of the feeler 66 with the processing data.
(Pi, Θi) [i = 1, 2, 3,..., N], and sequentially moves the carriage 15 from the output of the rotary encoder 34 to the processing data (Pi, Θi). The corresponding data is stored in the processing data memory 106.

Similarly, the keyboard unit 4 is operated to operate the stepping motor 31 by the arithmetic and control unit 100 to move the carriage 15 to the right in FIG. And the contact position of the feeler 66 is determined by machining data (P
i, Θi) are sequentially moved based on [i = 1, 2, 3,..., N], and the operation control circuit 100 calculates the movement amount of the carriage 15 corresponding to the processing data (Pi, Θi). The movement amount is stored in the processing data memory 106 in association with the processing data (Pi, Θi).

Then, the arithmetic and control circuit 100 calculates the lens L to be processed based on the amount of movement of the carriage 15 thus obtained.
The contact positions of the feeler 66 on the left and right refracting surfaces are determined in correspondence with the processing data (Pi, Θi).
The edge thickness Wi of the lens L to be processed is obtained in accordance with the processing data (Pi, Θi) from the contact position of the feeler 66 on the left and right refracting surfaces of the lens L to be processed corresponding to i).

(3) Lens Grinding The arithmetic control circuit 100 stores the machining data (Pi, Θi) in the machining data memory 102, and then controls the drive controller 101 to drive the motor 8 to drive the grindstone 5 Rotate.

Under the control of the arithmetic and control circuit 100, the drive controller 101 sets the lens rotation axes 22 and 23 to the angle Θi according to the processing data (Pi, Θi) stored in the processing data memory 106 from the pulse generator 51. Is supplied to the pulse motor 18 and the angle Θi
In order to prevent the carriage 15 from lowering at the position where the processing radius of the lens at Pi is, a pulse enough to stop the swing arm 300 is applied to this position at the pulse motor 37.
To supply.

Thus, the lens rotating shafts 22 and 23 are rotated by the processing radial angle Θi. On the other hand, while the lens RL is pressed against the grindstone 6 by the weight of the carriage 15 or the like, the lens RL is ground by the grindstone 6 and the carriage 15 is lowered by the weight of the carriage 15 with the grinding. When the carriage 15 descends, the swing arm 300 rises and comes into contact with the pressing member 40, and the processing radius of the lens RL is reduced.
It is performed until it becomes Pi.

At this time, the lens RL is moved to the grindstone 6 by the carriage 1.
Assuming that the pressure at the time of being pressed by the weight of the lens 5 is the working pressure, the working pressure is calculated by the arithmetic and control circuit 100.
The adjustment is made according to the edge thickness Wi of the RL. That is, the arithmetic control circuit 100 increases the processing pressure as the edge thickness Wi of the lens RL increases, while increasing the processing pressure.
Is reduced as the edge thickness Wi becomes smaller. The working pressure can be determined as a downward rotation moment Fi of the carriage 15 as follows.

Here, the rotational moment of the carriage 15 downward due to its own weight is f1, and the swing arm 300
Is defined as f2, the rotating torque below the portion excluding the weight of the weight 316 of the processing pressure adjusting means 310 is defined as f3, and the downward rotating moment by the weight 316 is fai (f1> f2 + f3 + fai). Then, the rotational moment Fi for actually rotating the carriage 15 downward is Fi = f1− (f2 + f3 + fai). Moreover, assuming that the weight of the weight 316 is Wg and the distance from the center of the support shaft 12 to the center of gravity of the weight 316 is Bi, the rotational moment fai downward of the weight 316
Is fai = Wg × Bi. The distance Bi can be changed by moving the weight 316 in the front-rear direction. This weight 316
Is controlled by the arithmetic and control circuit 100.

That is, as the edge thickness Wi of the lens RL increases, the arithmetic control circuit 100 controls the pulse motor 320 to rotate in the forward direction, rotates the feed screw 318 in the forward direction, and moves the weight 316 forward. . On the other hand, the arithmetic control circuit 1
00 controls the pulse motor 320 in reverse rotation as the edge thickness Wi of the lens RL decreases, and
8, the weight 316 is moved backward.

The weight 316 moves forward to reduce the rotational moment fai.
5, the rotating moment fi increases due to the rearward movement of the weight 316, and the rotating moment Fi (processing pressure) decreases below the carriage 15. .

Accordingly, as the edge thickness Wi of the lens RL increases, the processing pressure increases, while the edge thickness W of the lens RL increases.
Since the processing pressure decreases as i decreases, when a test lens having a large edge thickness is ground by the grindstone 6,
It is possible to prevent the whetstone 6 from slipping with respect to the lens to be inspected beforehand, and when the edge of the lens to be processed is small, an excessive processing pressure acts on the lens from the whetstone 6. Can be avoided. As described above, since the processing pressure of the lens to be processed is automatically adjusted according to the edge thickness Wi of the lens to be processed, the grinding operation can be performed efficiently without any trouble. In addition, it is possible to control the processing pressure so that the processing pressure can be adjusted depending on the type of the lens to be processed. The arithmetic control circuit is provided with a memory for adjusting the processing pressure in accordance with the lens type, and the processing pressure can be adjusted by reading out from the memory. For example, in the case of a plastic lens, the processing pressure is stored in a memory so as to be 3.5 kg, and in the case of a glass lens, the processing pressure is stored in a memory of 5.0 kg. Then, the arithmetic control circuit 100 controls the processing pressure adjusting device 310 by reading from the memory.

By executing this operation for all of the processing data (Pi, Θi), the lens L to be processed is roughly ground based on the processing data, and the lens RL having a similar shape to the lens frame RF.
Grinding.

When the rough grinding is completed by the grindstone 6, the lens RL is moved by a known carriage moving means (not shown), and the V-groove grindstone 7 performs beveling. At this time, the arithmetic control circuit 100
Based on the edge thickness corresponding to the processing data (Pi, Θi) obtained in (2), the peripheral edge of the lens RL is beveled.

The lens RL is moved so that its optical center OLR coincides with the rotation axis of the lens rotation axes 2, 2.
Is chucked.

The same operation as described above is executed for the left eye lens LL.

Thus, even if the lenses RF and LF are ground to be large in order to correspond to the cell frame, the optical centers of the lenses RF and LF framed in the frame will not be seen by the wearer's eyes when the spectacles are worn. The frame can be correctly framed so as to coincide with the optical center (pupil center).

In performing a series of processing operations as described above, when a lens is brought into contact with a grindstone and ground, heat is applied to the lens.
In addition, processing waste is generated. When this heat is cooled, grinding water is supplied through a grinding water pipe (not shown) during processing in order to remove grinding debris. in this case,
Supply may be stopped depending on the material or the like.

For this reason, it is desirable that the grinding water, grinding debris, etc., is not applied to the respective mechanical parts and electrical parts as much as possible. As shown in FIG. 2, the water receiving cover 401 includes only a grindstone and a carriage unit, and is configured to constitute a processing chamber separately from other mechanical units, electrical units, and the like.

In this processing chamber, a water receiving upper cover 402 is provided on a water receiving cover 401. The water receiving upper cover 402 has an opening for taking out a lens to be processed. The opening and closing window of the main body 1 shown in FIG. 7 allows the lens L to be processed to be attached and detached.

As shown in FIG. 4, between the carriage 15 and the water receiving cover 401, waterproof bellows 403 are attached on both sides.

By adopting such a configuration, the processing chamber is separated from other mechanical parts and electric parts, and the water receiving cover 401 is waterproof by the horizontal movement of the grinding wheel housing and the carriage 15 and the swing arm. It suffices to waterproof the rotational movement of the 300 supporting arms 26 (the vertical movement of the processing lens with the grindstone 5).

The housing of the grindstone section does not move, and only the rotational movement of the grindstone shaft needs to be waterproofed. The carriage 15 need only be waterproofed for the left and right moving parts and the rotational movement of the support arm 26 of the swing arm section 300. In addition, without providing waterproofing including the vertical movement of the conventional carriage 15,
It is sufficient to deal only with the rotary motion part in the vertical movement, and the correspondence can be performed only by the bellows 403 as shown in FIG. 4 and can be easily performed.

[Second Embodiment] In the embodiment described above, the edge thickness of the lens to be processed is measured by one feeler 66, but the present invention is not necessarily limited to this. For example, a lens edge thickness measuring unit 2 as shown in FIG.
00 may be provided to measure the edge thickness of the lens to be processed by the lens edge thickness measuring unit 200.

A. Lens Edge Thickness Measuring Unit The lens edge thickness measuring unit 200 is provided corresponding to the grindstone 5. This lens edge thickness measuring unit 200 is configured as shown in FIG.
As shown in (a), brackets 201 and 202 are mounted on the main body 1 in parallel at an interval in the front-rear direction, and a pair of parallel guides extending in the front-rear direction and fixed over the brackets 201 and 202. Rails 203 and 204 and guide rails 203 and 204 so as to be able to advance and retreat with respect to the carriage 15.
Has a plate-shaped movable base 205 held in the position.

Further, the lens edge thickness measuring section 200 corresponds to FIG.
5 (b) to (d), the guide rails 203 and 204
, A rack 206 fixed to the lower surface of the movable base 205, a pulse motor 207 fixed to the main body 1 at the lower surface of the movable base 205, and fixed to an output shaft 207 a of the pulse motor 207. And rack 2
A pinion 208 meshing with the reference numeral 06 and a microswitch MS fixed to the bracket 202 and detecting the origin of the movable base 205 are provided. By driving and controlling the pulse motor 207 to rotate the pinion 208, the movable base 205 is driven forward and backward with respect to the carriage 15 by the action of the pinion 208 and the rack 206.

Further, the lens edge thickness measuring section 200 includes a mounting plate 209 fixed above the movable base 205 with a space therebetween, a mounting plate 210 fixed above the mounting plate 209 with a space therebetween, and a mounting plate 2
Gears 211 and 212 rotatably held between and meshing with each other, a variable motor 213 fixed on a mounting plate 209, and a variable motor 2
A pinion 214 fixed to the output shaft 213a penetrating the thirteen mounting plates 209 and meshing with the gear 211;
A rotary encoder 215 (detection means) fixed on the mounting plate 209;
And a pinion 216 fixed to the output shaft 215 a penetrating through the mounting plate 209 and meshing with the gear 212.

Further, the lens edge thickness measuring section 200 includes filler shafts 217 and 218 in which base portions 217 a and 217 b are held by shaft portions 211 a and 212 a protruding from the mounting plate 210 of the gears 211 and 212, and a filler shaft 21.
Disc-shaped fillers 219 (first contactors) and 220 (second contactors) integrally provided at the tips of the shafts 7 and 218, and a spring 221 interposed between the filler shafts 217 and 218.
And the microswitch 2 fixed on the mounting plate 210 near the base end 217a of the filler shaft 217.
22. In FIG. 13, reference numeral 223 denotes a cover case that covers parts of the filler shafts 217 and 218 of the lens edge thickness measuring unit 200 and components other than the fillers 219 and 220.

By controlling the driving of the variable motor 213, the rotation of the variable motor 213 is controlled by the output shaft 213 a and the pinion 216 so that the gears 211 and 213 can rotate.
12, the filler shafts 217 and 218 are rotated in a direction away from each other against the spring force of the spring 221, and the gap between the fillers 219 and 220 is increased. At this time, the rotation of the gear 212 is transmitted to the rotary encoder 215 via the pinion 216 and the output shaft 215a, and the interval between the fillers 219 and 220 is obtained from the output of the rotary encoder 215.

Further, when the fillers 219, 220 are brought into contact with each other by the spring force of the spring 221, the microswitch 222 moves the base end 21 of the filler shaft 217.
It is turned on by being pressed at 7a.

The outputs from the rotary encoder 215, the microswitch 222, and the MS are input to the arithmetic and control circuit 100, and the pulse motor 207 and the variable motor 213 are controlled by the arithmetic and control circuit 100 via the drive controller 101. Has become.

When the movable base 205 is moved to the carriage 15, the arithmetic and control circuit 100 counts the number of drive pulses to the pulse motor 207 from the time when the microswitch MS is turned off.
The amount of movement of the movable base 205 toward the carriage 15, that is, the amount of movement of the fillers 219 and 220 toward the carriage 15 is calculated and obtained.

B. Measurement of lens edge thickness The lens L to be processed based on the processing data (Pi, Θi) corresponding to the radial data (fρi, fθi) obtained in the first embodiment.
Is obtained.

That is, the arithmetic control circuit (control means) 100
Is set to the edge thickness measurement mode, the variable motor 21
After the gap between the fillers 219 and 220 is opened by controlling the driving of the lens 3 as described above, the drive of the pulse motor 207 is controlled to move the movable base 205 toward the carriage 15, and the fillers 219 and 220 are moved toward the lens L to be processed. By moving to both sides, the operation of the motors 207 and 213 is stopped. As a result, the fillers 219 and 220 are
Are brought into contact with left and right refracting surfaces of the lens L to be processed.

In this state, the arithmetic and control circuit 100 controls the driving of the pulse motor 18 and also controls the pulse motor 207.
, The contact positions of the fillers 219 and 220 with the lens L to be processed are moved in accordance with the processing data (Pi, Θi), and the distance (edge thickness) between the feelers 219 and 220 is determined by the rotary encoder 215. Is obtained in correspondence with the processing data (Pi, Θi) from the output of.

At this time, if the lens has a step like a bifocal lens, when the filler 66 is positioned on the step side of the lens L, the feeler 66 cannot get over the step and an error occurs. Sometimes. (Note that the filler 219 may not be able to get over the step of the lens L with the fillers 219 and 220 described later.) In such a case, it is automatically determined that the lens is a bifocal lens or the like by the following method. Becomes possible.

Generally, in the case of a bifocal lens or the like, there is a step between the distance portion and the near portion as shown in FIG.

In order to solve this problem, a portion having a step from the distance portion to the near portion is determined as a bifocal lens or the like (hereinafter referred to as an EX lens) from data obtained when the portion is operated, and the sensor step difference is determined. Avoid malfunctions.

When measuring the lens edge thickness, the lens L to be processed is rotated with respect to the feeler 66 or 219 and 220 as shown in FIG. In this case, from high to low,
It moves without any problem, but if it rotates further and reaches the step on the opposite side, it will move from the lower side to the higher side, causing a problem.

When the first step is entered from a higher step to a lower step, it is determined whether or not this step is a certain value or more, for example, 0.5
It is determined whether the distance is not less than mm. Further, whether the level difference is gradually changing or abruptly changing from the output of the number of pulses for rotating the lens shafts 16 and 17 and the amount of change of the feeler via the pulse motor 18 for rotating the lens L to be processed. It is determined whether the lens is an EX lens by checking whether the lens is in use.

Generally, in the case of an EX lens, this step is within a certain width in the horizontal direction of the lens processing center with respect to the lens processing center. For this reason, it is possible to determine whether the lens is an EX lens, for example, by determining whether there is a sharp step in a range of about 5 mm upward and about 8 mm downward from the lens processing center.

As described above, when it is determined that the lens is an EX lens, the step on the opposite side is expected to be substantially near the horizontal position on the opposite side. For simplicity, it is expected to be near 180 ° opposite side.

For this reason, when it is determined that the step is the step of the EX lens, the measurement is further advanced from the position of the step, the measurement is stopped just before the expected step on the opposite side, and the measurement is once started or before the first step. Feeler 66 or 21 between
9 and 220 are returned in an open state, the lens shafts 16 and 17 are rotated in reverse from the positions via the pulse motor 18, and the steps on the opposite side are measured from higher to lower, and the measurement is stopped first. Measure to the position where it exceeded or beyond. The lens edge thickness of the entire circumference can be measured from both data. In this drawing, the feeler 66 or 21
The shapes of 9 and 220 were made into a Soloban ball shape.
The shape of the end portion is not limited to this, and may be a semicircular shape or a spherical shape. Further, the end portion may or may not rotate.

By performing such an operation, it is automatically determined that the lens is an EX lens, it is possible to prevent the lens from getting over at the step position on the opposite side, and the entire circumference of the lens edge thickness can be measured.

FIG. 14 shows an example of the liquid crystal display section 3 of the main body of FIG. In this case, various liquid crystal screens as shown in each measurement or processing mode are displayed. The operator can change various settings such as the processing mode and numerical values by operating the keyboard unit 4 while watching this display.

When the keyboard section 4 is operated, the liquid crystal display screen changes accordingly, but in the case of FIG.
Is highlighted, and the numerical value at that position can be changed.

When the numerical value can be changed, in the example of FIG. 13A, the numerical value is +2.00, but the numerical value is changed to, for example, -1.00 by operating the keyboard unit 4. In the case of changing, if simply setting it to -1.00 as it is, if + and-are mistaken, the processing will fail.

When the numerical value is changed by operating the keyboard unit 4, for example, when the value is changed from + to-, FIG.
As in the case of the display of the UP as shown in the above, if one or both of the numerical value and the sign are displayed in reverse as indicated by oblique lines, the discrimination can be made easier than when the display of the numerical value and + and-are simply changed. Become.

[0112]

As described above, according to the present invention, even when the step is remarkable, it is possible to determine the degree of the step, and based on the determination, the entire circumference of the edge of the spectacle lens can be accurately determined. Can be measured.

Further, it is possible to realize a spectacle lens framing having a good fit to the spectacle frame, and it is possible to form spectacles having a good appearance according to the taste of each spectacle wearer.

[Brief description of the drawings]

FIG. 1 is a control circuit diagram showing a first embodiment of a lens peripheral processing device (ball mill) according to the present invention.

FIG. 2 is a schematic perspective view showing an arrangement of a waterproof cover of the device shown in FIG.

FIG. 3 is a side view of FIG. 3;

FIG. 4 is a sectional view taken along line AA of FIG. 3;

FIG. 5 is a schematic rear view of the carriage mounting section shown in FIG.

6A is a partial schematic perspective view showing a relationship between a carriage and a swing arm shown in FIG. 1, and FIG. 6B is a perspective view for explaining a processing pressure adjusting means provided in FIG.

FIG. 7 is a schematic plan view showing the relationship between the carriage and the filler shown in FIG. 1;

8A is a sectional view taken along the line BB of FIG. 3, and FIG. 8B is a sectional view of FIG.
Explanatory diagram showing a closed state at a position along the line C-C, (c)
FIG. 3B is a cross-sectional view in a state of being opened along the line CC, and FIG.

FIG. 9 is a cross-sectional view showing a contact state between an EX lens and a filler.

FIG. 10 is a front view showing a contact state between an EX lens and a filler.

11 is an explanatory diagram illustrating a relationship between a lens to be processed and a lens frame shape illustrated in FIG. 1;

12 is an explanatory diagram showing an inward shift amount and an upward shift amount from the geometric center of the lens frame illustrated in FIG. 1;

FIG. 13 is an external view of a lens peripheral processing device (a balling machine) having the configuration shown in FIGS.

FIGS. 14A and 14B are explanatory diagrams of the display unit shown in FIG.

FIG. 15 (a) is a schematic plan view showing another example of the edge thickness measuring means of the lens peripheral processing device (ball mill) according to the present invention, that is, the relationship between the carriage and the filler, and (b) is (a). ) Is a sectional view taken along line BB, (c) is a sectional view taken along line CC in (b), (d)
FIG. 3B is an explanatory diagram showing the relationship between the rack and the pinion in FIG.

16 is a cross-sectional view similar to FIG. 8A, showing another example of the filler and the waterproof structure shown in FIG.

[Explanation of symbols]

 6: Grinding stone 12: Support shaft (rotating shaft) 15: Carriage 16, 17: Lens rotation shaft 60: Edge thickness measuring means 100: Operation control circuit (control means) 310: Processing pressure adjusting means L: Lens to be processed

────────────────────────────────────────────────── ───

[Procedure amendment]

[Submission date] June 26, 1997

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0102

[Correction method] Change

[Correction contents]

When measuring the lens edge thickness, the lens L to be processed is rotated with respect to the feeler 66 or 219 and 220 as shown in FIG. Note that FIG.
Trajectory of wheeler 66 or 219 and 220
But actually corresponded to the machining data (ρ _i , θ _i )
It draws a locus of a lens shape. In this case, it moves from the higher side to the lower side without any problem, but when it further rotates and comes to the step on the opposite side, it moves from the lower side to the higher side, causing a problem. ────────────────────────────────────────────────── ───

[Procedure amendment]

[Submission date] April 9, 1998

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Full text

[Correction method] Change

[Correction contents]

[Document Name] Statement

[Title of the Invention] Lens shape measuring device

[Claims]

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lens shape measuring device for measuring the edge thickness of a spectacle lens framed in a spectacle frame.

[0002]

2. Description of the Related Art Conventionally, in an eyeglass lens edge thickness measuring apparatus, as shown in Japanese Patent Application Laid-Open No. Hei 7-314307, a feeler as a tracing stylus is formed by a rotatable member, and a lens frame or template of an eyeglass frame is formed. It is arranged on the processing locus on the front surface and the rear surface of the spectacle lens having a predetermined relationship with the target lens shape, and measures the edge thickness of the spectacle lens.

[0003] This is to prevent the refraction surface of the spectacle lens from being damaged by the frictional resistance from the front and rear surfaces of the spectacle lens, or the measuring element itself from being deformed or damaged.

In particular, when measuring the edge thickness of an eyeglass lens (EX lens) having a step at the boundary between the distance portion and the near portion due to a difference in the lens thickness between the distance portion and the near portion, the tracing stylus is simply moved forward and backward. This is to solve the problem that the measuring element is caught on the step only by contacting with the refracting surface of the above, and the edge thickness cannot be measured accurately.

[0005]

However, in the conventional edge thickness measuring apparatus, particularly in the case of the EX lens, when the lens thickness between the distance portion and the near portion has a remarkable step, the portion where the lens thickness is thin is small. When the spectacle lens is rotated from a thick portion to a thick portion, a tracing stylus formed simply of a rotatable member cannot overcome the step, and may still be caught.

In the conventional edge thickness measuring device, the E
Since it is not possible to determine how much the X lens has a step, there is a possibility that the entire circumference of the edge of the spectacle lens cannot be accurately measured.

As a result, it has not been possible to realize a frame fit of a spectacle lens with a good fit to the spectacle frame, and it has not been possible to form good-looking spectacles according to the taste of each spectacle wearer.

Accordingly, in the present invention, in order to solve the above problem, the degree of the step of the spectacle lens is determined by detecting the step of the lens to be processed from the amount of change in the measurement data by the tracing stylus. If the level difference is significant, the entire circumference of the lens edge can be accurately measured by controlling the rotation direction of the spectacle lens and the contact position of the tracing stylus with the spectacle lens. It is an object of the present invention to provide a lens shape measuring device capable of realizing a frame fit of a spectacle lens with a good fit.

[0009]

According to the present invention, in order to achieve this object, a lens rotating shaft for rotatably supporting a lens to be processed is disposed in contact with a processing locus on a front surface and / or a rear surface of the lens to be processed. And a control means for detecting a step of the lens to be processed from the amount of change in the measurement data by the tracing stylus and performing contact control of the tracing stylus.

[0010]

Embodiments of the present invention will be described below with reference to the drawings.

[First Embodiment] <Grinding part> In FIG. 13, reference numeral 1 denotes a housing-like body of a ball mill, 2 denotes an inclined surface provided on the upper front side of the main body 1, and 3 denotes a right side of the inclined surface 2. The liquid crystal display unit 4 provided on the half is a keyboard unit provided on the lower right side of the inclined surface 2.

A processing chamber B to be described later is provided on the left side of the main body 1.
A is provided, and a grindstone 5 rotatably held by the main body 1 is disposed in the processing chamber BA. This whetstone 5
A rough grindstone 6 and a V-groove grindstone 7 are provided, and are rotatably driven by the motor 8 shown in FIG.

In the main body 1, a support base 9 for supporting the carriage shown in FIG. 5 is fixed. The support 9 is provided with left and right legs 9a and 9b, and the legs 9b are biased toward the legs 9b.
a, 9b, intermediate legs 9c, legs 9a to 9c
And a mounting plate 9d connecting the upper ends of the mounting plates 9d.

Further, brackets 10 and 11 for shaft mounting, which are covered by covers 14, are provided on both sides of the mounting plate 9d. The brackets 10 and 11 hold bearings B fitted to both left and right ends of a support shaft (swinging shaft, ie, a rotating shaft) 12, and a cylindrical shaft (swinging cylindrical shaft) 13 on the outer periphery of the supporting shaft 12. It is fitted so as to be movable in the axial direction. The support shaft 12, the cylindrical shaft 13 and the like are covered with a cover 14 shown in FIG.

A carriage 15 is provided inside the cover 14 and a plate-shaped swing arm 3 is provided.
00 and a working pressure adjusting device 310 attached to the swing arm 300.

In FIG. 2, a hollow water receiving container A is mounted in the main body 1. The water receiving container A includes a lower water receiving cover (water receiving container main body serving as a lower water receiving cover) 401 that opens upward, and the water receiving cover 401.
Has a water receiving upper cover 402 that closes an upper open end of the water receiver. A processing chamber BA is formed in the water receiving container A, and the above-described grindstone 5 and carriage 15 are formed in the processing chamber BA.
Are arranged.

In addition, the carriage 15 can swing up and down (swing and pivot) in the processing chamber BA covered by the cover 14. The swing arm 300 and the like are arranged outside the water receiving cover 401.
Further, as shown in FIG. 13, an opening C for taking in and out the lens L to be processed is formed in the water receiving upper cover 402 as a lens access window (opening / closing window), and this opening C is not shown. It is opened and closed with a window cover. Thereby, the lens L to be processed can be put in and out of the processing chamber.

As shown in FIG. 4, waterproof bellows 403, 403 are attached between the carriage 15 and the side walls 401a, 401b of the water receiving cover 401.

<Carriage> The carriage 15 has a carriage body 15a, mutually parallel arms 15b and 15c integrally provided forward on both sides of the carriage body 15a, and a center of the rear edge of the carriage body 15a. Has a projection 15d protruding rearward. The above-described cylindrical shaft 13 penetrates the protrusion 15d right and left, and is fixed to the protrusion 15d. Thus, the front end of the carriage 15 can be turned up and down around the support shaft 12.

A lens rotating shaft 16 is rotatably held on the arm 15b of the carriage 15, and the carriage 1
A lens rotating shaft 17 disposed coaxially with the lens rotating shaft 16 is rotatably held on the arm 15c of the fifth arm 15c so as to be able to advance and retreat with respect to the lens rotating shaft 16. The lens L to be processed is sandwiched between the opposed ends (between the one ends) of the lenses 17.

The lens rotating shafts 16 and 17 are rotatably driven by a shaft rotation driving device (shaft rotation driving means). This shaft rotation driving device has a pulse motor 18 fixed in the carriage main body 15a, and a power transmission mechanism (power transmission means) 19 for transmitting rotation of the pulse motor 18 to the lens rotation shafts 16 and 17.

As shown in FIG. 1, the power transmission mechanism 19 includes timing pulleys 20 and 20 mounted on lens rotation shafts 16 and 17, respectively, and a carriage body 15a.
A rotating shaft 21 rotatably held by the motor, and timing pulleys 22 fixed to both ends of the rotating shaft 21, respectively.
, A timing belt 23 stretched over timing pulleys 20 and 22, and a gear 24 fixed to the rotating shaft 21.
And a pinion 25 for output of the pulse motor 18 and the like.

As shown in FIGS. 5 and 7, the upper end of the support arm 26 is held on the support shaft 12 so as to be movable left and right (not shown in FIGS. 1 and 6). Moreover, the support shaft 1
2, a cylindrical shaft 13 is disposed adjacent to the support arm 26. The cylindrical shaft 13 is fitted to the support shaft 12 so as to be movable in the axial direction as described above. As apparent from the configuration of the carriage lateral movement means and the measurement of the lens edge thickness described later with reference to FIGS.
It is provided so as to be movable integrally with the support shaft 12 in the axial direction. Incidentally, both ends of a guide shaft 26a parallel to the support shaft 12 are fixed to the legs 9b and 9c as shown in FIG. The guide shaft 26a penetrates the lower end of the support arm 26, and guides the support arm 26 to be movable left and right.

<Carriage Lateral Moving Means> As shown in FIG.
And can be driven to move left and right.

As shown in FIG. 5, the carriage lateral moving means 29 includes a mounting plate 3 fixed to the leg 9c and the mounting plate 9d.
0a, a stepping motor 31 fixed to the front surface of the mounting plate 30a, and a mounting plate 30a of the stepping motor 31.
, A pulley 32 fixed to an output shaft 31a protruding to the rear side, a pulley 32a rotatably mounted on the rear surface of the leg 9b, and a support arm wound around the pulleys 32, 32a and having both ends. 26 has a wire 33 fixed to it.

<Swing Arm 300> The swing arm 300 is formed of a plate as described above. At both ends of the swing arm 300 in the left-right direction (Z direction), as shown in FIGS. 1 and 6A, protrusions 301 and 302 projecting forward are provided. This protrusion 3
01, 302 are provided with semicircular holding portions 301a, 3
The holding portions 301a and 302a are fitted to both ends of the cylindrical shaft 13. In addition, this holding part 30
Reference numerals 1a and 302a are fixed to the cylindrical shaft 13 by fixing means such as a screw or an adhesive (not shown).

<Working Pressure Adjusting Means 310> As shown in FIG. 6B, the working pressure adjusting means 310 has a mounting frame 311 serving as a mounting base. The mounting frame 311 includes a base plate 312 disposed on the lower surface of one side of the swing arm 300 in parallel with the swing arm 300, and a side plate extending in the front-rear direction (X direction) and fixed to the right side of the base plate 312. 313, a front side plate 314 fixed to the front edge of the base plate 312 and the side plate 313, and a rear side plate 315 fixed to the rear edge of the base plate 312 and the side plate 313. The mounting frame 311 is fixed to the lower surface of the swing arm 300 via a bracket, a screw, or the like (not shown).

The processing pressure adjusting means 310 includes a cubic weight 316 disposed above the base plate 312, a guide shaft 317 extending through the weight 316 in the front-rear direction (X direction), It has a feed screw 318 that is screwed to a female screw (not shown) extending in the front-rear direction provided on the weight 316 and penetrates the weight 316. Both ends of the guide shaft 317 are fixed to the side plates 314 and 315, and the feed screw 318 is rotatably held at both ends by the side plates 314 and 315. Note that the guide shaft 317 and the feed screw 318 are provided in parallel.

Further, the processing pressure adjusting means 310 includes a bracket 319 fixed on the base plate 312, a pulse motor 320 fixed to the bracket 319 and having an output shaft 320a directed in the front-rear direction, and an output of the pulse motor 320. It has a timing gear 321 fixed to the shaft 320a, a timing gear 322 fixed to a portion near the rear end of the feed screw 317, and a timing belt 323 wound around the timing gears 321 and 322. Thereby, the rotation of the pulse motor 320 is controlled by the timing gear 32.
1, 322 and the timing belt 323 to the feed screw 317.

When the pulse motor 320 is rotated forward, the feed screw 318 is rotated forward to move the weight 316 in the forward direction. On the other hand, when the pulse motor 37 is rotated in the reverse direction, the feed screw 318 is rotated in the reverse direction. Let me be the weight 3
16 can be moved rearward.

<Carriage Elevating Means> Also, the carriage elevating means 3 is provided on the rear edge of the swing arm 300 described above.
6 are provided. The carriage lifting / lowering means 36
A pulse motor 37 disposed vertically above the swing arm 300 and held in the main body 1 via a bracket (not shown), and coaxially and integrally with an output shaft 37a of the pulse motor 37. A female screw 38 provided, a female screw cylinder 39 screwed to the female screw 38 so as to be vertically movable, and a spherical pressing member 40 integrally provided at the lower end of the female screw cylinder 39
Having. The female screw cylinder 39 is held in the main body 1 via a bracket (not shown) so as to be non-rotatable around the axis and to be vertically movable.
Abut on the upper surface of the

<Eye Shape Measurement Unit (Eye Shape Measurement Means)> The eye shape measurement unit 46 includes a pulse motor 47, a rotating arm 48 attached to an output shaft 47 a of the pulse motor 47, and a rotating arm 48. Rail 49 held in
A filler support 50 movable in the longitudinal direction along the rail 49; a filler 51 (contact) mounted on the filler support 50; an encoder 52 for detecting the amount of movement of the filler support 50; It has a spring 53 for urging the support 50 in one direction.

It is to be noted that the lens shape measuring section 46 may be formed integrally with the lens processing device, or may be formed separately from the lens processing device and electrically connected to each other. The lens frame shape data measured by the lens frame shape measuring device may be temporarily input to a floppy disk or an IC card, and the lens processing device may be provided with a reading device for reading data from these storage media,
The configuration may be such that the eyeglass frame maker can input lens frame shape data to the lens processing apparatus online.

<Edge thickness measuring means 60> The edge thickness measuring means 60 shown in FIGS.
However, in order to reduce the size of the carriage 15, a waterproof cover for covering the upper portion of the carriage 15 as shown in FIGS. 2, 3, and 8A to 8C is actually used. Cover 40
2 attached to the upper part. In this case, the edge thickness measuring means 60 is disposed so as to be inclined from the swing arm 300 side to the front side, corresponding to the lens L to be processed held by the lens rotation shafts 16 and 17 in FIG. Is done.

Further, the feeler 66 of the edge thickness measuring means 60 can be moved into and out of the processing chamber BA through the opening 402a provided in the waterproof upper cover 402. However, during the grinding of the lens L to be processed by the grindstone 5, When the grinding fluid is supplied from a grinding fluid supply nozzle (not shown) to the grinding unit, the grinding fluid (grinding water) scattered from the lens to be processed or the grinding unit is prevented from permeating into the edge thickness measuring means 60 through the opening 402a. The opening / closing device 80 of the edge thickness measuring device shown in FIG. 8A is mounted between the processing chamber and the edge thickness measuring means 60, that is, on the waterproof upper cover 402 at the position of the opening 402a as follows. I have.

That is, the opening 402a is closed by the mounting plate 501 mounted on the upper waterproof cover 402 with the screw B1. The mounting plate 501 has a recess 501a protruding toward the processing chamber BA, and an opening 501c is formed in the bottom (bottom wall) 501b of the recess 501a. Also,
The mounting plate 50 along the concave portion 501a is provided in the concave portion 501a.
2 is fixed with a screw B2.

Further, the opening / closing device 80 for the edge thickness measuring device is
A bearing (a bearing projection) 83 provided on one side of an upper open end of the concave portion 502a and protruding from the mounting plate 502;
It has a bearing (bearing projection) 83 'that is fixed to the mounting plate 501 with a screw 83a at the other side of the upper open end of the upper opening 2a, and a rotating body D having a lower half disposed in the recess 502a. The rotating body D includes a cylindrical body 81 and end wall members 81b, 81b disposed in both ends of the cylindrical body (cylindrical window member) 81, and a cylindrical body 81 spaced apart in the circumferential direction. It has screws S1 and S2 fixed to 81b. In FIG. 8A, 502b
Is the bottom (bottom wall) of the mounting plate 502, and 502c is the bottom 502
b is an opening provided in b.

Then, the shaft portion 8 of the end wall members 81b, 81b
1c and 81c are rotatably held by bearings 83 and 83 '. Further, a pair of window openings 81d, 81d extending in the longitudinal direction are formed in the cylindrical body 81 at intervals of 180 ° in the circumferential direction. The feeler 66 (219 and 220 in FIG. 16 to be described later) can enter and exit through the window openings 81d and 81d.

The holding plate 86 disposed along the periphery of the opening 502a is fixed to the mounting plate 501 with screws 86b.
The packing 85 located above the holding plate 86 is aligned with the opening 501c of the mounting plate 501 so that the bottom 5 of the mounting plate 501
01b. Reference numeral 86a denotes an opening of the holding plate 80. When sealing the opening 501c, the packing 8 is used.
5 is located around the opening 81d and is in elastic contact with the cylindrical body 81. In the drawing, the packing 85 is connected to the opening 8 of the cylindrical body 81.
The gasket 85 is located around 1d and elastically contacts the cylindrical body 81. The packing 85 may be formed to be substantially equal to or slightly larger than the opening 81d of the cylindrical body 81.

A gear 88 fixed to one shaft portion 81c of the cylindrical body 81 is meshed with a gear 87 fixed to an output shaft of a drive motor 82, and the rotation is controlled by the drive motor 82. The drive motor 82 is fixed to the waterproof upper cover 402 via a bracket BT. Microswitches 89 and 90 are attached to the bracket Bt.

When the edge thickness measurement mode is selected, FIG.
The cylinder 81 is rotated by the motor 82 of FIG. 8A via the gears 86 and 87 so that the state shown in FIG. This rotation position is in the cylinder 81 as shown in FIG.
For example, the micro switches 89 and 90 are used for positioning by using the heads sa and sb of the screws S1 and S2.

The lens edge thickness measuring device 60 has a bracket 61 formed in a U-shape as shown in FIG. 7 and mounted on the carriage 15 and a bracket 61 which can move forward and backward with respect to the left side of the rough grind 5. A filler shaft 62 (measurement arm) held by 61, a rack 63 provided on the filler shaft 62, a pulse motor 64 fixed to the bracket 61, and an output shaft 64 a of the pulse motor 64 fixed to the rack 63 Meshed pinion 65 and filler shaft 6
2, a disk-shaped filler 66 provided integrally at one end of
There is a microswitch 67 fixed on the carriage 15 at the other end of the filler shaft 62.

The microswitch 67 is provided with a filler 6
When the lens 6 is retracted to a position outside the lens L to be processed, the other end of the filler shaft 62 is pressed and turned on.

<Electric part> Operation control circuit 100 of electric part D
(Control means) The motor 8, the stepping motor 31, the pulse motors 18, 37, 47, and 6 of the above-mentioned grinding section.
4 and the like, a drive controller 101 for driving and controlling the like, a frame data memory 102, an FPD / PD input device 103 for inputting a frame PD value FPD and a wearer interpupillary distance value PD, and a spectacle frame being a cell frame. A frame material input device 104 for inputting a message, a correction value memory 105 storing a correction value C predetermined according to the material of the frame, and processing data for processing the lens L
A processing data memory 106 for storing (Pi, Θi) is connected.

The FPD / PD input device 103 may be a manual input device such as a ten-key input device, an online input from an optometric device, or a reading device from optometric data storage means such as a floppy disk or an IC card. May be.

In addition, when the drive controller 101 is operated by the arithmetic and control circuit 100, a drive pulse is generated from the pulse generator 106 and the pulse motor 4 is driven.
Actuation of 7 causes rotation arm 48 to rotate.
Thereby, the feeler 51 is moved along the inner periphery of the lens frame RF or LF of the spectacle frame F (spectacle frame).

At this time, the moving amount of the feeler 51 described above is detected by the encoder 52 and is defined as the moving radius length fρi by the electrical component D
The same pulse as that supplied to the pulse motor 47 from the pulse generator 106 is input to the frame data memory 102 as the rotation angle of the rotary arm 48, that is, the radial angle fθi, and the frame (or template) ) Is stored as the radial data (fρi, fθi).

The operation of the lens processing apparatus having the above configuration will be described below.

(1) Eyeglass Shape Measurement First, the eyeglass shape measuring unit 46 is operated to obtain the shape shown in FIGS.
The shape of the eye frame such as the right eye lens frame RF or the mold plate of the eyeglass frame F as shown in FIG. 2 is measured, and the radial data (fρi, fθi) of the eyeglasses such as the lens frame (or the mold plate) are measured. (Where i =
1, 2, 3,... N) are obtained and stored in the frame data memory 102.

When the spectacle frame F is a cell frame, the processor inputs the fact to the arithmetic and control circuit 100 using the frame material input device 104.

The processor inputs the frame PD value FPD and the wearer's interpupillary distance value PD to the arithmetic and control circuit 100 through the FPD / PD input device 106. The arithmetic and control circuit 100 calculates the optical center of the right eye lens by the deformation of the spectacle frame after the lens framing from the input frame PD value FPD, the interpupillary distance value PD and the correction value C stored in the correction value memory 105. The correction inset amount IN 'in consideration of the OLR shift is obtained as IN' = {(FPD-PD) / 2} -C / 2 (1), and the lens frame stored in the frame data memory 102 is obtained. For each sampling point Qi of the lens frame (or template) radial data (fρi, fθi) having the origin at the geometric center of RF, the radial data is converted into xy coordinates. And calculate the x-coordinate value by the correction inset amount IN ′ in the x-axis direction.
(Horizontal direction) and process data based on the new origin
(Pi, Θi) (where i = 1, 2, 3, ……… N) And this is stored in the processing data memory 102.

Here, the correction value C is 0.3 to 0.5 mm when the spectacle frame F is made of a general material such as acetate, acrylic, nylon or propionate, and 0.8 when the spectacle frame F is made of a material rich in thermoplastic such as epoxy resin. ~ 1.0mm is selected. In order to correspond to a plurality of types of cell frames in this way, a plurality of input keys are provided in the frame material input device 107, and a plurality of correction values C are stored in the correction value memory 105 corresponding to each frame material input. It is good.

(2) Measurement of lens edge thickness Wi Next, the edge thickness Wi of the lens L to be processed is calculated based on the processing data (Pi, Θi) corresponding to the radial data (fρi, fθi) obtained in (1). Ask.

That is, when the keyboard section 4 is operated to set the edge thickness measurement mode, the arithmetic and control circuit 100 controls the drive of the pulse motor 18 via the drive controller 101 and the rotation of the pulse motor 18 is transmitted to the power transmission mechanism 19. To the lens shafts 16 and 17 via the
Initial machining data (P1, Θ1) of machining data (Pi, Θi)
Is moved to the contact position of the feeler 66.

Before moving the feeler 66 to the joint position of the lens L to be processed, the window of the cylindrical body 81 of the opening and closing device 80 for the edge thickness measuring device between the edge thickness measuring means 60 and the processing chamber should be closed. When the thickness measurement mode is set, open it.

When the edge thickness measurement mode is selected, the cylinder 81 is rotated via the gears 88 and 87 by the motor 82 shown in FIG. 8A, and as shown in FIG. ). This rotation position is as shown in FIG.
For example, by using the positioning using the heads sa and sb of the screw S1 (S2), the microswitch 88,
Control is performed at 89.

After the state as shown in FIG. 8C is reached, the feeler 66 or 219 and 220 is taken out of the processing chamber BA, and the lens L to be processed is measured.

When processing is performed, grinding water or grinding debris may adhere to the cylinder 81. As described above, when the grinding water or grinding debris adheres to the opening / closing windows of the feeler 66 or 219 and 220, the conventional method of opening and closing a flat plate-like material solidifies between the fixed base 402 and the opening and closing. Anything that cannot be done or that adheres when opening and closing may enter the feeler measuring unit, causing a failure.

In the case of FIG. 8A, the cylinder is rotated at the time of opening and closing, and the outer periphery is brought into contact with a packing 85 at that time.
5, so that it does not enter the feeler measuring section. Further, the packing 85 also plays a role of waterproofing between the cylindrical body 81 and the processing chamber BA.

Further, as compared with a conventional plate-shaped member which is opened and closed, only a cylindrical member needs to be rotated, so that the mechanism is simple and a compact structure can be realized.

The keyboard unit 4 is operated to operate the stepping motor 31 by the arithmetic and control circuit 100 to move the carriage 15 integrated with the cylinder shaft 13 to the left in FIG. At this time, the movement amount of the carriage 15 is input to the arithmetic control circuit 100.

After that, the drive controller 101 is operated by the arithmetic and control circuit 100 and the pulse motor 64 is operated.
Is driven to move the filler shaft 62 onto the grindstone 5 via the pinion 65 and the rack 63, and the feeler 66 of the filler shaft 62 is moved to the side of the lens L to be processed.

At this time, when the feeler shaft 62 moves away from the micro switch 67 with the movement of the feeler shaft 62 and the micro switch 67 is turned off, this OFF signal is input to the arithmetic control circuit 100, and the arithmetic control circuit 100 The movement amount of the feeler shaft 62 from the start of the OFF is detected from the number of drive pulses to the pulse motor 64. Moreover, the feeler 66 stores the processing data (Pi, Θ) of the lens L to be processed.
It is moved to the portion corresponding to the position of the initial machining data (P1, # 1) in i).

In this state, when the power supply to the stepping motor 31 is stopped and the stepping motor 31 is freely rotated, the carriage 15 and the support arm 26 are moved rightward in FIG. 4 by the spring force of a spring (not shown). Energized,
Workpiece lens L held between lens rotation shafts 16 and 17
Is in contact with the feeler 66. On this occasion,
The contact position is determined by the initial processing data (P1, 1) of the lens L to be processed.
1).

Then, the arithmetic and control circuit 100 controls the driving of the pulse motors 18 and 64 from the initial contact position of the feeler 66 to determine the contact position of the feeler 66 with the processing data.
(Pi, Θi) [i = 1, 2, 3,..., N], and sequentially moves the carriage 15 from the output of the rotary encoder 34 to the processing data (Pi, Θi). The corresponding data is stored in the processing data memory 106.

Similarly, the keyboard 4 is operated and the arithmetic and control circuit 100 operates the stepping motor 31.
Is operated to move the carriage 15 rightward in FIG. 7, and then the feeler 66 is brought into contact with the left refracting surface of the lens L to be processed, and the contact position of the feeler 66 is determined by the processing data.
(Pi, Θi) [i = 1, 2, 3,..., N], and sequentially move the carriage 15 corresponding to the processing data (Pi, Θi).
Is moved by the arithmetic and control circuit 100, and this movement amount is stored in the processing data memory 106 in correspondence with the processing data (Pi, Θi).

Then, the arithmetic and control circuit 100 calculates the lens L to be processed based on the amount of movement of the carriage 15 thus obtained.
The contact positions of the feeler 66 on the left and right refracting surfaces are determined in correspondence with the processing data (Pi, Θi).
The edge thickness Wi of the lens L to be processed is obtained in accordance with the processing data (Pi, Θi) from the contact position of the feeler 66 on the left and right refracting surfaces of the lens L to be processed corresponding to i).

(3) Lens Grinding The arithmetic control circuit 100 stores the machining data (Pi, Θi) in the machining data memory 102, and then controls the drive controller 101 to drive the motor 8 to drive the grindstone 5 Rotate.

Under the control of the arithmetic and control circuit 100, the drive controller 101 sets the lens rotation axes 22 and 23 to the angle Θi according to the processing data (Pi, Θi) stored in the processing data memory 106 from the pulse generator 51. Is supplied to the pulse motor 18 and the angle Θi
In order to prevent the carriage 15 from lowering at the position where the processing radius of the lens at Pi is, a pulse enough to stop the swing arm 300 is applied to this position at the pulse motor 37.
To supply.

Thus, the lens rotating shafts 22 and 23 are rotated by the processing radial angle Θi. On the other hand, while the lens RL is pressed against the grindstone 6 by the weight of the carriage 15 or the like, the lens RL is ground by the grindstone 6 and the carriage 15 is lowered by the weight of the carriage 15 with the grinding. When the carriage 15 descends, the swing arm 300 rises and comes into contact with the pressing member 40, and the processing radius of the lens RL is reduced.
It is performed until it becomes Pi.

At this time, the lens RL is moved to the grindstone 6 by the carriage 1.
Assuming that the pressure at the time of being pressed by the weight of the lens 5 is the working pressure, the working pressure is calculated by the arithmetic and control circuit 100.
The adjustment is made according to the edge thickness Wi of the RL. That is, the arithmetic control circuit 100 increases the processing pressure as the edge thickness Wi of the lens RL increases, while increasing the processing pressure.
Is reduced as the edge thickness Wi becomes smaller. The working pressure can be determined as a downward rotation moment Fi of the carriage 15 as follows.

Here, the rotational moment of the carriage 15 downward due to its own weight is f1, and the swing arm 300
Is defined as f2, the rotating torque below the portion excluding the weight of the weight 316 of the processing pressure adjusting means 310 is defined as f3, and the downward rotating moment by the weight 316 is fai (f1> f2 + f3 + fai). Then, the rotational moment Fi for actually rotating the carriage 15 downward is Fi = f1− (f2 + f3 + fai). Moreover, assuming that the weight of the weight 316 is Wg and the distance from the center of the support shaft 12 to the center of gravity of the weight 316 is Bi, the rotational moment fai downward of the weight 316
Is fai = Wg × Bi. The distance Bi can be changed by moving the weight 316 in the front-rear direction. This weight 316
Is controlled by the arithmetic and control circuit 100.

That is, as the edge thickness Wi of the lens RL increases, the arithmetic control circuit 100 controls the pulse motor 320 to rotate in the forward direction, rotates the feed screw 318 in the forward direction, and moves the weight 316 forward. . On the other hand, the arithmetic control circuit 1
00 controls the pulse motor 320 in reverse rotation as the edge thickness Wi of the lens RL decreases, and
8, the weight 316 is moved backward.

The weight 316 moves forward to reduce the rotational moment fai.
5, the rotating moment fi increases due to the rearward movement of the weight 316, and the rotating moment Fi (processing pressure) decreases below the carriage 15. .

Accordingly, as the edge thickness Wi of the lens RL increases, the processing pressure increases, while the edge thickness W of the lens RL increases.
Since the processing pressure decreases as i decreases, when a test lens having a large edge thickness is ground by the grindstone 6,
It is possible to prevent the whetstone 6 from slipping with respect to the lens to be inspected beforehand, and when the edge of the lens to be processed is small, an excessive processing pressure acts on the lens from the whetstone 6. Can be avoided. As described above, since the processing pressure of the lens to be processed is automatically adjusted according to the edge thickness Wi of the lens to be processed, the grinding operation can be performed efficiently without any trouble. In addition, it is possible to control the processing pressure so that the processing pressure can be adjusted depending on the type of the lens to be processed. The arithmetic control circuit is provided with a memory for adjusting the processing pressure in accordance with the lens type, and the processing pressure can be adjusted by reading out from the memory. For example, in the case of a plastic lens, the processing pressure is stored in a memory so as to be 3.5 kg, and in the case of a glass lens, the processing pressure is stored in a memory of 5.0 kg. Then, the arithmetic control circuit 100 controls the processing pressure adjusting device 310 by reading from the memory.

By executing this operation for all of the processing data (Pi, Θi), the lens L to be processed is roughly ground based on the processing data, and the lens RL having a similar shape to the lens frame RF.
Grinding.

When the rough grinding is completed by the grindstone 6, the lens RL is moved by a known carriage moving means (not shown), and the V-groove grindstone 7 performs beveling. At this time, the arithmetic control circuit 100
Based on the edge thickness corresponding to the processing data (Pi, Θi) obtained in (2), the peripheral edge of the lens RL is beveled.

The lens RL is moved so that its optical center OLR coincides with the rotation axis of the lens rotation axes 2, 2.
Is chucked.

The same operation as described above is executed for the left eye lens LL.

Thus, even if the lenses RL and LL are slightly ground to correspond to the cell frame, the lens frame
The optical centers of the lenses RL and LL framed in RF and LF are
When the spectacles are worn, the frame can be correctly framed so as to match the optical center (pupil center) of the wearer's eye.

In performing a series of processing operations as described above, when a lens is brought into contact with a grindstone and ground, heat is applied to the lens.
In addition, processing waste is generated. When this heat is cooled, grinding water is supplied through a grinding water pipe (not shown) during processing in order to remove grinding debris. in this case,
Supply may be stopped depending on the material or the like.

For this reason, it is desirable that the grinding water, grinding debris, etc., is not applied to the respective mechanical parts and electrical parts as much as possible. As shown in FIG. 2, the water receiving cover 401 includes only a grindstone and a carriage unit, and is configured to constitute a processing chamber separately from other mechanical units, electrical units, and the like.

In this processing chamber, a water receiving upper cover 402 is provided on a water receiving cover 401. The water receiving upper cover 402 has an opening for taking out a lens to be processed. The opening and closing windows of the main body 1 shown in FIG. 13 allow the lens L to be processed to be attached and detached.

As shown in FIG. 4, between the carriage 15 and the water receiving cover 401, waterproof bellows 403 are attached on both sides.

By adopting such a configuration, the processing chamber is separated from other mechanical parts and electric parts, and the water receiving cover 401 is waterproof by the horizontal movement of the grinding wheel housing and the carriage 15 and the swing arm. It suffices to waterproof the rotational movement of the 300 supporting arms 26 (the vertical movement of the processing lens with the grindstone 5).

The housing of the grindstone section does not move, and only the rotational movement of the grindstone shaft needs to be waterproofed. The carriage 15 need only be waterproofed for the left and right moving parts and the rotational movement of the support arm 26 of the swing arm section 300. In addition, without providing waterproofing including the vertical movement of the conventional carriage 15,
It is sufficient to deal with only the rotary motion part in the vertical movement, and the correspondence can be easily performed only with the bellows 403 as shown in FIG.

[Second Embodiment] In the embodiment described above, the edge thickness of the lens to be processed is measured by one feeler 66, but the present invention is not necessarily limited to this. For example, a lens edge thickness measuring unit 2 as shown in FIG.
00 may be provided to measure the edge thickness of the lens to be processed by the lens edge thickness measuring unit 200.

A. Lens Edge Thickness Measuring Unit The lens edge thickness measuring unit 200 is provided corresponding to the grindstone 5. This lens edge thickness measuring unit 200 is configured as shown in FIG.
As shown in (a), brackets 201 and 202 are mounted on the main body 1 in parallel at an interval in the front-rear direction, and a pair of parallel guides extending in the front-rear direction and fixed over the brackets 201 and 202. Rails 203 and 204 and guide rails 203 and 204 so as to be able to advance and retreat with respect to the carriage 15.
Has a plate-shaped movable base 205 held in the position.

Further, the lens edge thickness measuring section 200 corresponds to FIG.
5 (b) to (d), the guide rails 203 and 204
, A rack 206 fixed to the lower surface of the movable base 205, a pulse motor 207 fixed to the main body 1 at the lower surface of the movable base 205, and fixed to an output shaft 207 a of the pulse motor 207. And rack 2
A pinion 208 meshing with the reference numeral 06 and a microswitch MS fixed to the bracket 202 and detecting the origin of the movable base 205 are provided. By driving and controlling the pulse motor 207 to rotate the pinion 208, the movable base 205 is driven forward and backward with respect to the carriage 15 by the action of the pinion 208 and the rack 206.

Further, the lens edge thickness measuring section 200 includes a mounting plate 209 fixed above the movable base 205 with a space therebetween, a mounting plate 210 fixed above the mounting plate 209 with a space therebetween, and a mounting plate 2
Gears 211 and 212 rotatably held between and meshing with each other, a variable motor 213 fixed on a mounting plate 209, and a variable motor 2
A pinion 214 fixed to the output shaft 213a penetrating the thirteen mounting plates 209 and meshing with the gear 211;
A rotary encoder 215 (detection means) fixed on the mounting plate 209;
And a pinion 216 fixed to the output shaft 215 a penetrating through the mounting plate 209 and meshing with the gear 212.

Further, the lens edge thickness measuring section 200 includes filler shafts 217 and 218 in which base portions 217 a and 217 b are held by shaft portions 211 a and 212 a protruding from the mounting plate 210 of the gears 211 and 212, and a filler shaft 21.
Disc-shaped fillers 219 (first contactors) and 220 (second contactors) integrally provided at the tips of the shafts 7 and 218, and a spring 221 interposed between the filler shafts 217 and 218.
And the microswitch 2 fixed on the mounting plate 210 near the base end 217a of the filler shaft 217.
22.

By controlling the driving of the variable motor 213, the rotation of the variable motor 213 is controlled by the output shaft 213 a and the pinion 216 so that the gears 211 and 213 can rotate.
12, the filler shafts 217 and 218 are rotated in a direction away from each other against the spring force of the spring 221, and the gap between the fillers 219 and 220 is increased. At this time, the rotation of the gear 212 is transmitted to the rotary encoder 215 via the pinion 216 and the output shaft 215a, and the interval between the fillers 219 and 220 is obtained from the output of the rotary encoder 215.

Further, when the fillers 219, 220 are brought into contact with each other by the spring force of the spring 221, the microswitch 222 moves the base end 21 of the filler shaft 217.
It is turned on by being pressed at 7a.

The outputs from the rotary encoder 215, the microswitch 222, and the MS are input to the arithmetic and control circuit 100, and the pulse motor 207 and the variable motor 213 are controlled by the arithmetic and control circuit 100 via the drive controller 101. Has become.

When the movable base 205 is moved to the carriage 15, the arithmetic and control circuit 100 counts the number of drive pulses to the pulse motor 207 from the time when the microswitch MS is turned off.
The amount of movement of the movable base 205 toward the carriage 15, that is, the amount of movement of the fillers 219 and 220 toward the carriage 15 is calculated and obtained.

B. Measurement of lens edge thickness The lens L to be processed based on the processing data (Pi, Θi) corresponding to the radial data (fρi, fθi) obtained in the first embodiment.
Is obtained.

That is, the arithmetic control circuit (control means) 100
Is set to the edge thickness measurement mode, the variable motor 21
After the gap between the fillers 219 and 220 is opened by controlling the driving of the lens 3 as described above, the drive of the pulse motor 207 is controlled to move the movable base 205 toward the carriage 15, and the fillers 219 and 220 are moved toward the lens L to be processed. By moving to both sides, the operation of the motors 207 and 213 is stopped. As a result, the fillers 219 and 220 are
Are brought into contact with left and right refracting surfaces of the lens L to be processed.

In this state, the arithmetic and control circuit 100 controls the driving of the pulse motor 18 and also controls the pulse motor 207.
, The contact positions of the fillers 219 and 220 with the lens L to be processed are moved in accordance with the processing data (Pi, Θi), and the distance (edge thickness) between the feelers 219 and 220 is determined by the rotary encoder 215. Is obtained in correspondence with the processing data (Pi, Θi) from the output of.

At this time, if the lens has a step like a bifocal lens, when the filler 66 is positioned on the step side of the lens L, the feeler 66 cannot get over the step and an error occurs. Sometimes. (Note that the filler 219 may not be able to get over the step of the lens L with the fillers 219 and 220 described later.) In such a case, it is automatically determined that the lens is a bifocal lens or the like by the following method. Becomes possible.

Generally, in the case of a bifocal lens or the like, there is a step between the distance portion and the near portion as shown in FIG.

In order to solve this problem, a portion having a step from the distance portion to the near portion is determined as a bifocal lens or the like (hereinafter referred to as an EX lens) from data obtained when the portion is operated, and the sensor step difference is determined. Avoid malfunctions.

When measuring the lens edge thickness, the lens L to be processed is rotated with respect to the feeler 66 or 219 and 220 as shown in FIG. In FIG. 10, for explanation, but the trajectory of the feeler 66 or 219 and 220 are circular, but actually to the locus of the lens shape corresponding to the processed data (ρ _i, θ _i). In this case, it moves from the higher side to the lower side without any problem, but when it further rotates and comes to the step on the opposite side, it moves from the lower side to the higher side, causing a problem.

When the first step is entered from a higher step to a lower step, it is determined whether or not this step is a certain value or more, for example, 0.5
It is determined whether the distance is not less than mm. Further, whether the level difference is gradually changing or abruptly changing from the output of the number of pulses for rotating the lens shafts 16 and 17 and the amount of change of the feeler via the pulse motor 18 for rotating the lens L to be processed. It is determined whether the lens is an EX lens by checking whether the lens is in use.

Generally, in the case of an EX lens, this step is within a certain width in the horizontal direction of the lens processing center with respect to the lens processing center. For this reason, it is possible to determine whether the lens is an EX lens, for example, by determining whether there is a sharp step in a range of about 5 mm upward and about 8 mm downward from the lens processing center.

As described above, when it is determined that the lens is an EX lens, the step on the opposite side is expected to be substantially near the horizontal position on the opposite side. For simplicity, it is expected to be near 180 ° opposite side.

For this reason, when it is determined that the step is the step of the EX lens, the measurement is further advanced from the position of the step, the measurement is stopped just before the expected step on the opposite side, and the measurement is once started or before the first step. Feeler 66 or 21 between
9 and 220 are returned in an open state, the lens shafts 16 and 17 are rotated in reverse from the positions via the pulse motor 18, and the steps on the opposite side are measured from higher to lower, and the measurement is stopped first. Measure to the position where it exceeded or beyond. The lens edge thickness of the entire circumference can be measured from both data. In this drawing, the feeler 66 or 21
The shapes of 9 and 220 were made into a Soloban ball shape.
The shape of the end portion is not limited to this, and may be a semicircular shape or a spherical shape. Further, the end portion may or may not rotate.

By performing such an operation, it is automatically determined that the lens is an EX lens, it is possible to prevent the lens from getting over at the step position on the opposite side, and the entire circumference of the lens edge thickness can be measured.

FIG. 14 shows an example of the liquid crystal display section 3 of the main body of FIG. In this case, various liquid crystal screens as shown in each measurement or processing mode are displayed.

While looking at this display, the operator can operate the keyboard unit 4 to change various settings such as the processing mode and numerical values.

When the keyboard section 4 is operated, the liquid crystal display screen changes accordingly. In the case of FIG.
Is highlighted, and the numerical value at that position can be changed.

When the numerical value can be changed, the numerical value is +2.00 in the example of FIG. 14A, but the numerical value is changed to, for example, -1.00 by operating the keyboard unit 4. In the case of changing, if simply setting it to -1.00 as it is, if + and-are mistaken, the processing will fail.

When the numerical value is changed by operating the keyboard unit 4, for example, when the value changes from + to −, as shown in FIG. If you highlight it as shown, you can simply
Discrimination can be performed more easily than when the display of-only changes.

[0113]

As described above, according to the present invention, even when the step is remarkable, it is possible to detect the degree of the step, and based on the detection, the entire circumference of the edge of the spectacle lens can be accurately determined. Can be measured.

Further, it is possible to realize a spectacle lens framing having a good fit to the spectacle frame, and to form spectacles having a good appearance according to the taste of each spectacle wearer.

[Brief description of the drawings]

FIG. 1 is a control circuit diagram showing a first embodiment of a lens peripheral processing device (ball mill) according to the present invention.

FIG. 2 is a schematic perspective view showing an arrangement of a waterproof cover of the device shown in FIG.

FIG. 3 is a side view of FIG. 3;

FIG. 4 is a sectional view taken along line AA of FIG. 3;

FIG. 5 is a schematic rear view of the carriage mounting section shown in FIG.

6A is a partial schematic perspective view showing a relationship between a carriage and a swing arm shown in FIG. 1, and FIG. 6B is a perspective view for explaining a processing pressure adjusting unit in FIG.

FIG. 7 is a schematic plan view showing the relationship between the carriage and the filler shown in FIG. 1;

8A is a sectional view taken along the line BB of FIG. 3, and FIG. 8B is a sectional view of FIG.
Explanatory diagram showing a closed state at a position along the line C-C, (c)
FIG. 3B is a cross-sectional view in a state of being opened along the line CC, and FIG.

FIG. 9 is a cross-sectional view showing a contact state between an EX lens and a filler.

FIG. 10 is a front view showing a contact state between an EX lens and a filler.

11 is an explanatory diagram illustrating a relationship between a lens to be processed and a lens frame shape illustrated in FIG. 1;

12 is an explanatory diagram showing an inward shift amount and an upward shift amount from the geometric center of the lens frame illustrated in FIG. 1;

FIG. 13 is an external view of a lens peripheral processing device (a balling machine) having the configuration shown in FIGS.

FIGS. 14A and 14B are explanatory diagrams of the display unit shown in FIG.

FIG. 15 (a) is a schematic plan view showing another example of the edge thickness measuring means of the lens peripheral processing device (ball mill) according to the present invention, that is, the relationship between the carriage and the filler, and (b) is (a). ) Is a sectional view taken along line BB, (c) is a sectional view taken along line CC in (b), (d)
FIG. 3B is an explanatory diagram showing the relationship between the rack and the pinion in FIG.

16 is a cross-sectional view similar to FIG. 8A, showing another example of the filler and the waterproof structure shown in FIG.

[Description of Signs] 6 ... Whetstone 12 ... Support shaft (rotating shaft) 15 ... Carriage 16, 17 ... Lens rotation shaft 60 ... Edge thickness measuring means 100 ... Operation control circuit (control means) 310 ... Working pressure adjusting means L ... Processing lens

[Procedure amendment 2]

[Document name to be amended] Drawing

[Correction target item name] Fig. 1

[Correction method] Change

[Correction contents]

FIG.

[Procedure amendment 3]

[Document name to be amended] Drawing

[Correction target item name] Figure 2

[Correction method] Change

[Correction contents]

FIG. 2

[Procedure amendment 4]

[Document name to be amended] Drawing

[Correction target item name] Fig. 5

[Correction method] Change

[Correction contents]

FIG. 5

[Procedure amendment 5]

[Document name to be amended] Drawing

[Correction target item name] Fig. 7

[Correction method] Change

[Correction contents]

FIG. 7

[Procedure amendment 6]

[Document name to be amended] Drawing

[Correction target item name] Fig. 8

[Correction method] Change

[Correction contents]

FIG. 8

[Procedure amendment 7]

[Document name to be amended] Drawing

[Correction target item name] Fig. 9

[Correction method] Change

[Correction contents]

FIG. 9

[Procedure amendment 8]

[Document name to be amended] Drawing

[Correction target item name] FIG.

[Correction method] Change

[Correction contents]

FIG. 13

[Procedure amendment 9]

[Document name to be amended] Drawing

[Correction target item name] FIG.

[Correction method] Change

[Correction contents]

FIG. 16

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Takeshi Nakamura 75-1, Hasunumacho, Itabashi-ku, Tokyo Topcon Corporation (72) Inventor Hisao Fujinuma 75-1, Hasunumacho, Itabashi-ku, Tokyo Topcon Corporation (72) Inventor Shinji Uno 75-1, Hasunuma-cho, Itabashi-ku, Tokyo, Japan Inside Topcon Corporation (72) Inventor Jun Akiyama 75-1, Hasunuma-cho, Itabashi-ku, Tokyo Inside Topcon Corporation

Claims (1)

[Claims] 1. A lens rotation axis for rotatably supporting a lens to be processed, a tracing stylus disposed in contact with a processing locus on a front surface and / or a rear surface of the lens to be processed, and measurement data of the tracing stylus. A lens shape measuring device, comprising: a control unit for determining whether or not the amount of change is greater than a predetermined value and performing contact control of a tracing stylus.